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Although most of the time power is measured in Watts, it can also be expressed as Js-1.

So in your question, you are given the amount of joules and the time in hours. First, convert 5 hours to seconds. There are 60 mins in an hour and 60 seconds in a minute.

So that's going to be 5x60x60 = 18000 seconds

Now all you do in divide the number of joules by the number of seconds to work out the power.

So that's 7500/18000 = 0.41666666666...

approximately, 0.42Js-1(2dp) and thats the same as 0.42W (2dp)

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Q: What is the power in watts when 7500 J of energy are used in 5 h?

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